KR20140023397A - Machine tool and machining method - Google Patents

Abstract

The main shaft 10, which is capable of holding the workpiece 200 (workpiece) and being rotatable around its axis C1, the main shaft motor 20 (spindle driving portion) for rotating the main shaft 10, and the main shaft 10 The rotary guide bush 30 and the rotary guide bush 30 which rotatably support the work 200 protruding from the tip in a state eccentric with respect to the shaft center C1 by the length E, and the rotary guide bush 30 as the main shaft ( Guide bush servo motor 40 (guide bush driving portion) which rotates around shaft center C1 in synchronization with 10), and rotary guide bush 30 in a rotated state and a guide for selectively switching to a stopped state. The control part 50 which controls rotational drive of the bushing servomotor 40 is provided.

Description

Machine Tools and Processing Methods {MACHINE TOOL AND MACHINING METHOD}

TECHNICAL FIELD This invention relates to a machine tool and a processing method. Specifically, It is related with the improvement of what provided with the eccentric guide bush.

Conventionally, machine tools, such as lathes, hold | maintain the workpiece | work (henceforth a workpiece | work), such as a round bar, on a main shaft, and process it with a tool, rotating the workpiece which protruded from the front-end | tip of a main shaft.

In addition, there is also provided with a guide bush that keeps the distance between the work and the tool at all times precisely by supporting the work right next to the tool and reliably suppresses the deformation of the work (see Patent Document 1).

Here, when machining a part of a workpiece | work to the shape eccentric in the radial direction, it is necessary to move the axial center of a workpiece from the rotation center, ie, the axial center of a main axis.

In this case, for example, a chucking device (fixing device) for fixing the workpiece to the main shaft is operated to offset the axis of the workpiece by a desired amount with respect to the axis of the spindle (see Patent Document 2).

Patent Document 1: Japanese Patent Application Laid-Open No. 10-138007 Patent Document 2: Japanese Utility Model Publication No. 59-12509 (Japanese Utility Model Application No. 57-107933)

However, the above-mentioned operation of the chucking device when performing an eccentric shape requires a lot of work, and there is a problem that the total processing time becomes long.

This invention is made | formed in view of the said situation, and an object of this invention is to provide the machine tool and the processing method which can carry out the operation | movement at the time of performing an eccentric shape processing easily.

In the machine tool and the processing method according to the present invention, an eccentric shape is formed by performing an eccentric shape by using an eccentric guide bush for supporting a workpiece protruding from the tip of the main shaft in an eccentric state with respect to the axis of the main shaft. This is to simplify the operation when performing the processing.

That is, the machine tool which concerns on this invention is provided with the eccentric guide bush which supports the workpiece which protruded from the front-end | tip of a main shaft in the eccentric state with respect to the axial center of the said main shaft.

On the other hand, in the machine tool according to the present invention, it is preferable that the eccentric guide bush is switched to a state in which the eccentric guide bush is rotated around the axis of the main shaft and in a stopped state.

Moreover, the machine tool which concerns on this invention adjusts the rotation of the said eccentric guide bush, and the rotation of the said main shaft so that the phase of the said workpiece can be changed in the part which eccentrically supports the said workpiece, of the said eccentric guide bush. It is desirable to.

The machining method according to the present invention uses an eccentric guide bush which rotates a spindle around its axis and supports a workpiece projected from the tip of the spindle in an eccentric state with respect to the axis of the spindle. It is characterized by performing the processing.

On the other hand, in the machining method according to the present invention, it is preferable to switch the eccentric guide bush to the state in which the eccentric guide bush is rotated around the axial center and the eccentric guide bush is stopped.

Moreover, the processing method which concerns on this invention adjusts the rotation of the said eccentric guide bush, and the rotation of the said main shaft so that the phase of the said workpiece can be changed in the part which eccentrically supports the said workpiece, of the said eccentric guide bush. It is desirable to.

According to the machine tool and the processing method according to the present invention, it is possible to easily operate an eccentric shape of machining.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the principal part of the automatic lathe which is a specific embodiment of the machine tool which concerns on this invention.
It is a figure which shows the switching state (state which rotated the rotary guide bush) in the case of performing an eccentric process, and is a side view (rotary guide bush is a cross section) corresponded to FIG.
It is a figure which shows the switching state (state which rotated the rotary guide bush) in the case of performing an eccentric process, and is the figure seen from the arrow A in FIG. 2A.
3: A is a figure which shows the switching state (state which stopped the rotary guide bush) in the case of performing normal processing, Comprising: It is a side view (rotary guide bush is cross section) corresponded to FIG.
It is a figure which shows the switching state (state which stopped the rotary guide bush) in the case of performing normal processing, Comprising: It is the figure seen from the arrow A in FIG. 3A.
4 is a view showing a rotary guide bush chamfered to the corner portion.
It is a figure which shows the positional relationship of the height position of the center of a workpiece | work and the blade edge of a tool, and shows the state (FIG. 1) in which a height position is coincident.
It is a figure which shows the positional relationship of the height position of the center of a workpiece | work and the blade edge of a tool, and shows the state (second figure) in which a height position is coincident.
It is a figure which shows the positional relationship of the center of a workpiece | work and the height position of the blade tip of a tool, and shows the state in which a height position does not correspond.
It is a figure explaining the procedure which specifies the rotation position (rotation angle position) of a rotary guide bush, and is a figure which shows arbitrary stationary states.
It is a figure explaining the procedure which specifies the rotation position (rotation angle position) of a rotary guide bush, Comprising: It rotated 180 degrees from the stop state of FIG. 6A, and was stopped.
FIG. 7A is a diagram corresponding to FIGS. 2 and 3 showing a state in which the phase of the work in the hole of the rotary guide bush is changed, showing a first machining portion. FIG.
FIG. 7B is a diagram corresponding to FIGS. 2 and 3 showing a state in which the phase of the work in the hole of the rotary guide bush is changed, showing a first machining portion and a second machining portion. FIG.
Fig. 7C is a diagram corresponding to Figs. 2 and 3 showing a state in which the phase of the work in the hole of the rotary guide bush is changed, showing a first machining portion, a second machining portion, and a third machining portion; to be.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the machine tool and the processing method which concern on this invention is described with reference to drawings.

(Configuration)

FIG. 1: is a schematic diagram which shows the principal part of the automatic lathe as one Example of the machine tool which concerns on this invention, Comprising: It is a partial sectional drawing by the broken line about the rotary guide bush 30 (eccentric guide bush) mentioned later.

Specifically, this automatic lathe holds the work 200 (workpiece) and rotates the main shaft 10 and the main shaft 10 around the axis C1, which are rotatable around the axis C1. The main shaft motor 20 (spindle drive unit) and the work 200 protruding from the tip of the main shaft 10 are eccentric with the length E in the radial direction with respect to the shaft center C1 of the main shaft 10. Rotary guide bush 30 rotatably supported, guide bush servo motor 40 (guide bush drive section) for rotating rotary guide bush 30 around axis center C1 of main shaft 10, and rotary guide A controller 50 for controlling the rotational drive of the servomotor 40 for the guide bush so as to selectively rotate the bush 30 together with the main shaft 10 and to stop the rotation thereof, and a rotary guide bush ( The blade which is arrange | positioned in the vicinity of 30 and processes the workpiece | work 200 which protruded from the rotary guide bush 30 is And a tool (60) of the like.

The workpiece 200 is formed of a flexible material capable of generating a deformation corresponding to at least the eccentricity E described later, in the range of the distance between the tip of the main shaft 10 and the rotary guide bush 30. .

The main shaft 10 is provided with a chucking device (not shown) such as a collet chuck for fixing the center of the work 200 to coincide with the shaft center C1, and the work 200 is driven by the work fixing device. It is held at (10).

The control part 50 is equipped with the input part 51 which inputs the instruction | indication which switches the above-mentioned rotated state and the stopped state, The rotation or stop which was input to the input part 51 by the user who operated this automatic shelf, etc. In accordance with the instruction of, the controller 50 controls the rotational drive of the servomotor 40 for the guide bush.

Specifically, when the rotation instruction is input to the input unit 51, the control unit 50 synchronizes the rotary guide bush 30 with the main shaft 10 with respect to the servomotor 40 for the guide bush. Is rotated so as to rotate around the shaft center C1, and when a stop instruction is input to the input unit 51, the controller 50 controls the rotary guide bush 30 with respect to the servomotor 40 for the guide bush. The rotational drive is stopped so as to make the stop).

In addition, although the control part 50 also controls the rotational drive of the main shaft motor 20, this control is well-known general control.

And when the control part 50 controls to drive the servomotor 40 for guide bushes rotationally, by referring to the process of the control which drives the spindle motor 20 to rotate, the rotation of the spindle motor 20 Control to be synchronized rotation.

Synchronous rotation means the rotation in which the rotational angular velocity of the guide bush servomotor 40 and the main shaft motor 20 corresponded. Accordingly, the phase difference does not occur between the guide bushing servo motor 40 and the main shaft motor 20 during rotation.

The rotary guide bush 30 schematically shows a cylindrical shape, and the outer circumferential surface 31 of the case 35 is disposed so that the center of the cylindrical outer circumferential surface 31 coincides with the axis C1 of the main shaft 10. It is maintained rotatably by).

On the other hand, the center C2 of the inner circumferential surface 32 of the rotary guide bush 30 is configured to be disposed at a position eccentric with respect to the axial center C1 of the main shaft 10 by the eccentricity E described above.

The inner circumferential surface 32 is an outer edge of the hole 32a (part that eccentrically supports the workpiece) formed in a radius such that the outer circumferential surface 200a of the workpiece 200 is loosely contacted and penetrated. The center of the substantially coincides with the center C2 of the inner circumferential surface 32 of the rotary guide bush 30, and between the outer circumferential surface 200a of the workpiece 200 and the inner circumferential surface 32 of the rotary guide bush 30, the rotary guide The relative rotation of the work 200 with respect to the bush 30 is made possible.

The servomotor 40 for a guide bush is provided with the motor main body 41 and the belt 42 which transmits the rotational drive force generate | occur | produced by this motor main body 41 to the outer peripheral surface 31 of the rotary guide bush 30. The rotary guide bush 30 whose rotation driving force is transmitted to the outer circumferential surface 31 by this belt 42 is the center of the outer circumferential surface 31 (axial center C1 of the main shaft 10) in synchronization with the main shaft 10. Rotate around.

The amount of eccentricity E of the rotary guide bush 30 is a length smaller than the radius of the workpiece | work 200. As shown in FIG.

(Action, effect)

Next, the operation and effect of the automatic lathe of the present embodiment will be described.

In addition, the operation | movement of this automatic lathe is one Embodiment of the processing method which concerns on this invention.

First, as shown in FIG. 1, when the workpiece 200 is set on the automatic lathe, when the eccentric machining of the shape eccentrically by the eccentric amount E with respect to the center of the workpiece 200 is carried out by the user or the like, Instructions of rotation corresponding to the execution of the eccentric machining are input to the input unit 51.

The control unit 50 controls the main shaft motor 20 to rotate the main shaft 10 at a rotational angular velocity around the shaft center C1, and in accordance with an instruction of the rotation input to the input unit 51, the rotary guide. The guide bush servomotor 40 is controlled to rotate the bush 30 around the center of the outer circumferential surface 31 of the rotary guide bush 30 at the same direction and at the same rotational angular velocity as the main shaft 10.

As a result, the main shaft 10 rotates at a rotational angular velocity determined around the axis center C1, and the rotary guide bush 30 has a main shaft around the center of the outer circumferential surface 31 thereof, as shown in FIGS. 2A and 2B. Rotate in the same direction and at the same rotation angular velocity as in (10).

At this time, the inner circumferential surface 32 of the rotary guide bush 30 is a rotation that revolves around the axial center C1 of the main shaft 10, as shown in FIG. 2B.

On the other hand, since the workpiece 200 rotates integrally with the main shaft 10, the workpiece 200 is rotated at the same direction and at the same rotational angular velocity as the main shaft 10.

As a result, there is no relative rotation between the inner circumferential surface 32 of the rotary guide bush 30 and the outer circumferential surface 200a of the workpiece 200 supported through the hole 32a, i.e., there is no phase difference. As shown in FIG. 2B, the reference numeral 200 rotates around the axis C1 of the main shaft 10.

And the tool 60 is pressed by the workpiece | work 200 in this state, and the workpiece | work 200 is eccentric with respect to the center of the workpiece | work 200 by the eccentric amount E (cross section centering on the axial center C1). Circular shape; 2a and 2b].

On the other hand, when processing a shape which is not eccentric with respect to the center of the workpiece 200 (a cross section whose circular shape is centered on the center of the workpiece 200), the user or the like responds to the execution of this non-eccentric processing. An instruction to stop is input to the input unit 51.

The control unit 50 controls the main shaft motor 20 to rotate the main shaft 10 at a rotational angular velocity around the shaft center C1, and in accordance with the instruction of the stop input to the input unit 51, the rotary guide. The control to stop the guide bushing servomotor 40 is performed so that the bush 30 may be stopped without rotating.

Accordingly, the rotary guide bush 30 maintains the stationary state shown in FIGS. 3A and 3B, but the workpiece 200 is rotated integrally with the main shaft 10 at the same direction and at the same rotational angular velocity.

As a result, in the hole 32a of the rotary guide bush 30 which does not rotate, only the workpiece 200 rotates at the same rotational angular velocity as the main shaft 10.

That is, the workpiece 200 rotates around the center C2 of the hole 32a of the rotary guide bush 30 as shown in FIG. 3B.

And the tool 60 is pressed by the workpiece | work 200 in this state, and the workpiece | work 200 is processed into the shape which is not eccentric with respect to the center of the workpiece | work 200 (it shows with a dashed-dotted line in FIGS. 3A and 3B). do.

As described above, according to the automatic lathe of the present embodiment, when the workpiece 200 is eccentrically processed, the chucking device provided on the spindle 10 does not need to be replaced or changed by the eccentric one. The trouble of the operation to be performed can be reduced, and prolongation of the processing time by replacement of a chucking device etc. can be prevented.

Moreover, according to the automatic lathe of this embodiment, in the case of carrying out the eccentric work of the workpiece | work 200, and in the case of normal processing (machining about the shape centering on the center of the workpiece | work 200) instead of eccentric work, a main axis ( It is not necessary to replace or change the chucking device of 10), and the guide bush which supports the workpiece 200 right next to the tool 60 can be replaced with the eccentric rotary guide bush 30 and the non-eccentric general guide bush. There is no need.

Therefore, the effort required for the operation of replacing or changing the chucking device and the operation of replacing the guide bush at the time of switching between the eccentric processing and the normal processing is unnecessary, and the entire time of the machining by the automatic lathe can be shortened. .

In addition, since switching between the eccentric processing and the normal processing can be realized by a simple operation just by switching the rotation and the stop of the guide bushing servomotor 40, the operability can be improved.

On the other hand, although this embodiment is an example applied to an automatic lathe, the machine tool which concerns on this invention is not limited to this embodiment, It may be a manual lathe, If it rotates, and performs eccentricity and normal machining, it will be another kind of thing. It may be a machine tool.

In addition, as shown in FIG. 4, the automatic lathe of the present embodiment is adjacent to the inner circumferential surface 32 of the end surface 33 on the side facing the main shaft 10 among the end faces of the rotary guide bush 30. It is preferable to chamfer the edge part 34.

Since the rotary guide bush 30 supports the workpiece 200 in a state in which the workpiece 200 is deformed by the amount corresponding to the eccentricity E, a relatively strong contact pressure acts on the corner portion 34 than other portions. have.

In particular, in the present invention in which only the workpiece 200 may be rotated while the rotary guide bush 30 is stopped, the edge portion 34 and the workpiece 200 relatively move in contact with a strong contact pressure. There is a fear that a portion of the workpiece 200 that contacts the edge portion 34 (the annular portion along the circumferential direction of the workpiece 200) may be injured or worn out.

On the other hand, by chamfering the edge part 34, the above-mentioned contact pressure can be reduced and generation | occurrence | production of the above-mentioned wound and abrasion can be suppressed.

In addition, the edge part 34 which chamfers does not need to be the whole of the torus which is the intersection with the inner peripheral surface 32 in the end surface 33, The part corresponding to the direction in which the workpiece | work 200 was deformed, ie, Only the part which contacts the workpiece | work 200 by strong contact pressure is sufficient.

The shape of the chamfer is not limited to being straight (shape of inclined surface in conical shape) in the cross section shown in FIG. 4, but is, for example, in a shape that conforms to the shape of the outer peripheral surface 200a of the deformed workpiece 200. You may also

In chamfering in the shape along the outer circumferential surface 200a of the workpiece 200, the surface after the chamfering comes into contact with the outer circumferential surface 200a of the workpiece 200 in a large area, whereby contact in a specific portion is suppressed. The contact pressure can be further reduced.

In the above-described embodiment, the rotary guide bush 30 is driven by the guide bush servo motor 40 and the belt 42 for transmitting the rotational driving force separate from the rotary guide bush 30. The machine tool and the processing method according to the present invention are not limited to this configuration, and a configuration in which a so-called built-in motor is applied as a guide bush driving unit, in which a motor for driving the rotary guide bush 30 is integrally inserted into the rotary guide bush 30 itself. May be adopted.

In addition, instead of providing a guide bush servo motor 40 dedicated to driving the rotary guide bush 30, a mechanical mechanism (transmission mechanism) for transmitting the rotational driving force of the spindle motor 20 to the rotary guide bush 30. And a clutch mechanism for selectively switching a connection state for transmitting the rotational driving force generated by the spindle motor 20 to the rotary guide bush 30 and a disconnection state for not transmitting to a part of the mechanism. You may.

In this case, the transmission mechanism including the main shaft motor 20 and the clutch mechanism functions as a guide bush driving portion.

In addition, in the above-mentioned embodiment, although it was an instruction | indication of a user etc. which were input to the input part 51 of the control part 50, not only the instruction which is input manually but the instruction recorded as part of a machining program may be sufficient as this instruction | command. .

That is, in the case of a numerically controlled (NC) machine such as an automatic lathe among machine tools, the machining operation is controlled by a machining program. Therefore, the rotary guide bush 30 is rotated and stopped by the instruction of such machining program. Just instruct.

Specifically, when stopping the rotation of the rotary guide bush 30 from the synchronized state of the rotary guide bush 30 and the main shaft 10, the rotary guide bush 30 alone from the controlled state of the synchronized rotation. The rotary guide bush 30 can be brought into a stopped state by giving a command to transition to the control state, stopping the rotary guide bush 30 at a predetermined rotation angle position and maintaining the stopped position.

In the automatic lathe of the present embodiment, the state in which the rotary guide bush 30 functions as an eccentric guide bush which rotates the rotary guide bush 30 around the axis C1 of the main shaft 10 in synchronization with the main shaft 10 and the main shaft 10 Eccentric machining and central machining (non-eccentric machining) with one rotary guide bush 30 by switching the state functioning as the fixed guide bush which rotates only the workpiece 200 without rotating the rotary guide bush 30 even if it rotates. ) Can be performed.

The tool 60 which processes the workpiece | work 200 is with respect to the workpiece | work 200 supported by the fixed guide bush from the outer peripheral surface 200a of the workpiece | work 200 toward the extension line of the axial center C1 of the main shaft 10. It is arrange | positioned so that it may advance linearly.

That is, the cutting edge 60a of the tool 60 is disposed in the same horizontal plane as the shaft center C1, for example, as shown in FIGS. 5A, 5B, and 5C, and the outer peripheral surface 200a of the workpiece 200. It is arrange | positioned so that it may advance in a normal line direction, and the height position H of the shaft center C1 of the main shaft 10 and the blade edge 60a of the tool 60 is made to coincide.

In the case where the rotary guide bush 30 in the present embodiment functions as an eccentric guide bush and then functions as a fixed guide bush, the hole 32a of the rotary guide bush 30 at the end point when the rotary guide bush 30 functions as the eccentric guide bush. 5C or 5B, when the position of the center C2 of FIG. 5 is on the line which connects the position of the shaft center C1, and the position of the blade tip 60a of the tool 60, a fixed guide bush When functioning as a position, the center of the workpiece 200 and the height position H of the blade tip 60a of the tool 60 coincide with each other.

On the other hand, as shown in FIG. 5C, the position of the center C2 of the hole 32a of the rotary guide bush 30 at the end time which functioned as an eccentric guide bush is the position of the shaft center C1, and a tool. When not acting as a fixed guide bush when the position of the blade tip 60a of the 60 is not connected to the line, the position H along the vertical direction of the center of the workpiece 200 and the blade tip 60a of the tool 60 is used. ) Does not match.

If the center of the workpiece 200 and the height position H of the blade tip 60a of the tool 60 do not coincide, the feed amount toward the shaft center C1 of the tool 60 and the reduction amount of the radius of the workpiece 200 are reduced. Since it does not coincide, the dimension of the workpiece | work 200 after processing does not become what intended.

Therefore, when the rotary guide bush 30 in this embodiment functions as a fixed guide bush, it is important to match the height position H of the center of the workpiece | work 200 with the blade edge 60a of the tool 60. As shown in FIG. .

Therefore, in the automatic lathe of this embodiment, when the rotary guide bush 30 functions as a fixed guide bush, the control part 50 always stops the rotary guide bush 30 at a fixed position so that the servomotor for a guide bush can be used. In the stop state of the rotary guide bush 30 or the stop of the rotary guide bush 30, the stop position is detected based on the workpiece 200 supported through the hole 32a, and the stop position is moved to a constant position. What is necessary is just to control the drive of the guide bushing servomotor 40 so that correction may be carried out.

Specifically, as a specific configuration for controlling the driving of the guide bushing servo motor 40 so that the rotary guide bush 30 is always stopped at a constant position, the rotary guide bush 30 is formed of the hole 32a. Servo motor 40 for the guide bush to stop at the rotational position shown in FIG. 5A or the rotational position shown in FIG. 5B where the center C2 and the height position H of the blade tip 60a of the tool 60 coincide. ), And the rotation position shown in Fig. 5A based on a rotation position detector such as a rotary encoder that detects the rotation position of the rotary guide bush 30 and the rotation position detected by the rotation position detector. Or a control device for controlling the driving of the guide bushing servomotor 40 so as to stop at the rotational position shown in FIG. 5B.

In addition, the control apparatus in this structure may be a structure which also functions as the control part 50. As shown in FIG.

On the other hand, when the rotary guide bush 30 is not controlled at the time of stopping, the position of the workpiece 200 supported by the hole 32a in the state of the stop position is not known. ) Is brought into contact with the outer circumferential surface 200a of the workpiece 200 in place of the pickup, and the stop position of the rotary guide bush 30 is specified based on the detected position of the workpiece 200, and the specified stop position. And a control device for controlling the driving of the servomotor 40 for the guide bush so as to rotate the rotary guide bush 30 to the rotation position shown in FIG. 5A or the rotation position shown in FIG. 5B. You can do

More specifically, in a state where the rotary guide bush 30 is stopped, as shown in FIG. 6A, the tool 60 is disposed at any two different points P1 and P2 of the outer circumferential surface 200a of the workpiece 200. ) End of the blade (60a).

The coordinates of the two points P1 and P2 obtained by obtaining the respective coordinates of the two points P1 and P2 that the blade tip 60a has reached from the movement amount of the tool 60 are input to the controller 50. The movement amount of the tool 60 is also detected by the controller 50.

The control part 50 is based on the coordinates of the two input points P1 and P2 and the already known radius R of the work 200, and the center of the work 200, that is, the center C2 of the hole 32a. Calculate the coordinates of

Subsequently, the control unit 50 rotates the rotary guide bush 30 by an angle of 180 degrees, and stops it, making it the state shown in FIG. 6B.

Then, as described above, the blade tip 60a of the tool 60 is applied to any two different points P3 and P4 of the outer circumferential surface 200a of the workpiece 200 to adjust each coordinate of the two points P3 and P4. The controller 50 determines the center of the workpiece 200, that is, the center C2 of the hole 32a based on the coordinates of the two points P3 and P4 and the known radius R of the workpiece 200. Calculate the coordinates.

The control part 50 is the coordinate of the center C2 (refer FIG. 6A) of the hole 32a before the rotary guide bush 30 rotates by 180 degrees, and the center C2 of the hole 32a after rotation. ) (See FIG. 6B), the midpoint with the coordinates of the shaft center C1 is calculated, and the coordinates of the shaft center C1 and the hole 32a before the rotary guide bush 30 is rotated by 180 degrees. Based on the coordinates of the center C2 of), the control part 50 specifies the rotation position of the rotary guide bush 30.

And the control part 50 rotates the rotary guide bush 30 from the specified stop position to the rotation position shown in FIG. 5A, or the rotation position shown in FIG. 5B, and the servo motor 40 for guide bushes. ) Control the driving.

In this way, the automatic lathe of this embodiment can match the center position C2 of the hole 32a of the rotary guide bush 30, and the height position H of the blade edge 60a of the tool 60. As shown in FIG.

(Modified example)

The automatic lathe of the above-described embodiment controls the control of the control unit 50 to rotate the guide bush servo motor 40 to be synchronized with the spindle motor 20 when the control unit 50 rotates the guide bush servo motor 40. However, the machine tool according to the present invention is not limited to this embodiment.

For example, when the control part 50 rotates the guide bushing servo motor 40 like the modification demonstrated below, at least one of the guide bushing servo motor 40 and the spindle motor 20 rotates. The phase may be shifted between the rotary guide bush 30 and the workpiece 200, and then controlled to rotate the guide bush servomotor 40 and the spindle motor 20 in synchronization.

Since the control part 50 changes the phase between the rotary guide bush 30 and the workpiece | work 200 by controlling the drive of the guide bushing servo motor 40 and the spindle motor 20 as mentioned above, It functions as a phase controller.

Specifically, the control unit 50 rotates and drives the guide bushing servo motor 40 and the spindle motor 20 in synchronization, so that the hole 32a of the rotary guide bush 30 is shown in FIG. 7A. Of the workpiece 200 at a predetermined angle position around the center of the workpiece 200, that is, at an angle θ with respect to a horizontal plane passing through the center of the workpiece 200 in the illustrated work. A machined portion 210 eccentric with respect to the center is formed.

Subsequently, the control part 50 stops the guide bushing servo motor 40 and the spindle motor 20 together, and after that, as shown in FIG. 7B, the hole 32a of the rotary guide bush 30 is carried out. In order to change the phase of the workpiece 200 around the center of the workpiece 200 only at the angle α, only the main motor 20 is rotated by a predetermined angle α, and after the phase is changed, the main shaft motor 20 To stop the rotation.

Next, the control unit 50 rotates and drives the guide bushing servo motor 40 and the spindle motor 20 in synchronization, so that the hole 32a of the rotary guide bush 30 is shown in FIG. 7B. The center of the workpiece 200 is a fixed angle position around the center of the workpiece 200, that is, the angle 200 with respect to the horizontal plane passing through the center of the workpiece 200 in the illustrated work. A machined portion 220 eccentric with respect to is formed.

The machined portion 210 obtained in the first machining has a phase shifted by an angle α around the center of the workpiece 200 with respect to the machined portion 220 after the control of the phase change by the controller 50. It becomes a state. That is, the machining part 210 is eccentric to the position of angle (theta) '(= (theta) + (alpha)) with respect to the horizontal surface which passes through the center of the workpiece | work 200.

Moreover, the control part 50 stops the guide bushing servomotor 40 and the spindle motor 20 together, and after that, as shown in FIG. 7C, the hole 32a of the rotary guide bush 30 is carried out. Only the main shaft motor 20 is rotated by a predetermined angle α so as to change the phase around the center of the workpiece 200 by an angle α, and after the phase is changed, the rotation of the main shaft motor 20 is stopped and controlled. .

Next, the control unit 50 rotates and drives the guide bushing servo motor 40 and the spindle motor 20 in synchronization with each other, so that the hole 32a of the rotary guide bush 30 is shown in FIG. 7C. In the workpiece 200 supported by, the machined portion 230 eccentric with respect to the center of the workpiece 200 is formed at a position at a predetermined angle θ around the center of the workpiece 200.

The processed part 220 obtained by the 2nd process has the phase shifted by the angle (alpha) about the center of the workpiece | work 200 with respect to the subsequent process part 230 by control of the phase by the control part 50 hereafter. It becomes a state, and the process part 210 obtained by the initial process becomes a state where the phase was shifted by the angle 2 (alpha) about the center of the workpiece | work 200 with respect to the process part 230 after that. That is, the machined portion 210 is eccentric to the position of the angle θ ″ (= θ + 2α) with respect to the horizontal plane passing through the center of the workpiece 200, and the machined portion 220 passes through the center of the workpiece 200. It is eccentric with the position of angle (theta) '(= (theta) + (alpha)) with respect to a horizontal plane.

As described above, according to the automatic lathe of the modification, the rotary guide bush 30 is rotated around the shaft center C1 of the main shaft 10 in synchronization with the main shaft 10, and the hole of the rotary guide bush 30 ( By combining the states of changing the phase of the workpiece 200 in 32a), a plurality of machining portions 210, 220, 230 having different eccentric directions can be easily formed by one rotary guide bush 30. Can be.

This means that by shifting the phase of the rotary guide bush 30 and the work, the amount of eccentricity between the machined portions of the work 200 is not limited to the amount of eccentricity E of the rotary guide bush 30 itself.

And according to the automatic lathe of a modification, the eccentric amount between the process parts of the workpiece | work 200 can be set to 2 times the eccentricity E of the rotary guide bush 30 itself by shifting a phase 180 degree | times.

Moreover, according to the automatic lathe of a modification, the eccentric amount between the process parts of the workpiece | work 200 is set to the range below the eccentricity E of the rotary guide bush 30 itself by displacing a phase in the range below 60 degree | times. It may be.

Therefore, according to the automatic lathe of a modification, only one rotary guide bush 30 can process corresponding to a some eccentric amount.

Using the above, even if the eccentricity of the machined portion 210 is formed smaller than the desired eccentricity, the phase is shifted relative to the machined portion 210 so as to compensate for the insufficient eccentricity Δ. By performing the processing, the eccentric amount of the machined portion 210 based on the machined portion 220 can be set as the desired eccentric amount.

Similarly, even when the amount of eccentricity of the machined portion 210 is greater than the desired amount of eccentricity, the phase is shifted with respect to the machined portion 210 so as to reduce the excess amount of eccentricity Δ. By performing the above, the amount of eccentricity of the machined portion 210 based on the machined portion 220 can be set as the desired amount of eccentricity.

Moreover, in the automatic lathe of this modification, the control part 50 stops the control which makes the guide bush servomotor 40 and the spindle motor 20 rotate rotationally, and stops the guide bush servomotor 40, By combining the control for rotating only the main motor 20 for rotation, the machined parts 210, 220, 230 having a phase difference are formed.

On the other hand, the control part 50 does not stop the guide bushing servomotor 40, and makes rotation drive which the phase of the guide bushing servomotor 40 and the spindle motor 20 continuously change, It is also possible to control these two motors 40 and 20.

In this way, by rotating the motor so as to continuously change the phases of both the motors 40 and 20 without stopping the guide bushing servo motor 40, the discontinuous machining portions 210 having the step shown in FIG. 7C are provided. Instead of 22 and 230, it is also possible to form a spirally shaped machining portion such as, for example, a screw spring, in which the phase between the machining portions is continuously changed, and the feed amount in the direction of the axis C1 of the workpiece 200 and both motors ( By controlling by the control part 50 which adjusts the degree of displacement of the phase between 40 and 20, the workpiece | work 200 can also be formed in a more complicated three-dimensional shape.

Moreover, the machine tool which concerns on this invention should just be equipped with the rotary guide bush 30 which can be rotated at least with the main shaft 10, and the rotary guide bush 30 as described in the above-mentioned embodiment may be equipped with the main shaft 10 It is not necessary to selectively switch to the state rotated together with) and the state in which the rotation is stopped.

Therefore, like the automatic lathe of a modified example, when the control part 50 gives a phase difference between the servomotor 40 for guide bushes and the spindle motor 20, the control part 50 makes a rotary guide bush 30. FIG. ) Does not control the rotational drive of the servomotor 40 for the guide bush so as to selectively switch the state with the main shaft 10 rotated together with the main shaft 10 to be stopped. The phase difference between the guide bushing servo motor 40 and the spindle motor 20 may be changed by increasing or decreasing the rotational speed of the servo motor 40.

Cross Reference of Related Applications

This application claims priority based on Japanese Patent Application No. 2011-188563 for which it applied to Japan Patent Office on August 31, 2011, and all the content of that indication is integrated in this specification by reference.

10: spindle
20: spindle motor (spindle drive unit)
30: rotary guide bush (eccentric guide bush)
32a: hole (part that supports the workpiece eccentrically)
40: Servo Motor for Guide Bush (Guide Bush Drive Part)
50: control unit (control unit, phase control unit)
200: workpiece (workpiece)
C1: shaft center
C2: center
E: length, eccentricity

Claims (9)

And an eccentric guide bush for supporting the workpiece protruding from the tip of the spindle in an eccentric state with respect to the shaft center of the spindle. The machine tool according to claim 1, wherein the eccentric guide bush is switched between a state in which the eccentric guide bush is rotated around the axis of the main shaft and in a stopped state. 3. The spindle according to claim 2, wherein the main shaft drive unit rotates the main shaft about its axis, the guide bush drive unit rotates the eccentric guide bush around the shaft center, and the eccentric guide bush rotates about the axis in synchronization with the main shaft. And a control unit for controlling the guide bush driving unit to switch to the state in which the eccentric guide bush is stopped. The rotation of the eccentric guide bush and the main shaft according to any one of claims 1 to 3 so as to change the phase of the workpiece in a portion of the eccentric guide bush which eccentrically supports the workpiece. Machine tool, characterized in that for adjusting the rotation of the. 5. The part according to claim 4, wherein the main shaft drive unit rotates the main shaft around the shaft center, the guide bush drive unit rotates the eccentric guide bush around the shaft center, and the eccentric guide bush supports the workpiece. And a phase controller for controlling at least one of the spindle drive and the guide bush drive to change the phase of the workpiece. Chamfering is carried out in the edge part adjacent to the inner peripheral surface which supports the said to-be-worked object of the end surface of the end surface of the eccentric guide bush towards the said main axis among the end surfaces of the said eccentric guide bush, The chamfering in any one of Claims 1-5. Machine tool characterized in that there is. Processing the workpiece by using an eccentric guide bush which rotates the main shaft around the shaft center and supports the workpiece protruding from the tip of the spindle in an eccentric state with respect to the shaft center of the spindle. Processing method The processing method according to claim 7, wherein the eccentric guide bush is switched to a state in which the eccentric guide bush is rotated around the axial center of the main shaft and in a state in which the eccentric guide bush is stopped. The rotation of the eccentric guide bush and the rotation of the main shaft according to claim 7 or 8, wherein the rotation of the eccentric guide bush is adjusted so as to change the phase of the workpiece at the portion of the eccentric guide bush which eccentrically supports the workpiece. Processing method characterized in that.

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